Eave wall and the bottom should shoot and should not be handled without drilling holes in the wrong.
Wolf and from the original drilling holes in the sheepfold, and carried off a sheep.
He is now experimenting with drilling holes in the gems and knotting them together in varying configurations.
A section bar of a self tapping screw for saving drilling hole is provided with high-tightening force, which belongs to the design preparation technical field of the section bar.
The paper also presents measures for preventing drilling hole curve, drilling technique in broken zone and fissure zone and technique of sealing hole and pluging loophole.
